JPS6147655B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stylus attachment device for a copy milling machine.

As is well known, in a copy milling machine, a model and a workpiece are placed side by side on a table, and as a stylus attached to the tip of a tracer head traces the surface of the model, a rotating blade cuts the workpiece. , the workpiece is to be cut according to the model shape. The stylus mounting section of a conventional copy milling machine is configured such that the stylus is inserted into a stylus device hole formed in the tracer head, and the stylus is fixed by the only tightening screw provided next to the mounting hole. Here, the stylus is replaced from time to time depending on the machining process, so if the stylus is used for a long time, the axis of the tracer head and the axis of the stylus may become twisted due to wear of the insertion part, etc. As a result, there was a risk that machining accuracy would deteriorate.

The stylus mounting device for a copy milling machine of the present invention has a stylus mounting clamp in which three tightening screws are arranged radially around a stylus mounting hole, and a bearing is interposed between the clamp and the tracer head, so that the clamp is concentric and It is characterized by being rotatably mounted, making it easy to detect eccentricity when the stylus is mounted using a dial gauge, etc., making correction easy, and greatly reduces the frictional resistance caused by contact with the model at the tip of the stylus. This was done to improve machining accuracy and prevent stylus wear.

An embodiment of the present invention will be described below with reference to the drawings. In the copy milling machine shown in Fig. 1, a model 2 and a workpiece 3 are placed side by side on a table 1, a stylus 5 attached to a tracer head 4 is placed on the model 2, and a stylus 5 attached to a tracer head 4 is placed on the model 2, and a Rotary cutters 7 attached to the main shaft 6 are facing each other. FIG. 2 shows details of the attachment portion of the stylus 5 in longitudinal section. A pair of rolling bearings 9, 9 are fitted onto the outer periphery of the shaft 8 at the tip of the tracer head 4, with a bush 10 in between, and the bearings 9, 9 can be removed by bolts 11 at the end of the shaft 8.
It is fixed by the fixed lid plate 12. Bearing 9,9
The cylindrical part 14 of the clamp 13 is fitted onto the outer periphery of the
The clamp 13 is attached to the tracer head 4 so as to be concentric and rotatable. Clamp 1
3 has three tightening screws 17 radially arranged at equal angular intervals around a mounting hole 16 through which the stylus 5 is inserted.

In such a stylus attachment device, the stylus 5 is fixed by tightening the three tightening screws 17, and the dial gauge 18 is attached to the tracer head 4.
Attach the mounting base 19. Then, the stylus of the dial gauge 18 is brought into contact with the outer periphery of the tip of the stylus 5, and the stylus is slowly rotated by the bearings 9, 9. At that time, if the stylus 5 is installed eccentrically, the pointer of the dial gauge 18 will move, so tighten the three tightening screws 1 until the pointer hardly moves.
Correct the eccentric condition by adjusting the screw tightening in step 7.
Next, the dial gauge 18 is removed and the tip of the stylus 5 is brought into contact with the surface of the model 2 to perform a tracing operation.
Since the stylus 5 is rotatably attached, the stylus 5 rolls when tracing the inclined surface of the model 2, which greatly reduces frictional resistance, allowing accurate tracing to be performed without pressing the model surface. .

FIG. 4 shows another embodiment of the stylus attachment structure of the present invention, in which a rolling bearing is mounted on a cylindrical portion 20 fixed to the tracer head 4, contrary to the rolling bearing of the previous embodiment. The outer ring of the bearing 21 is fixed, and the clamp 22 is fixed to the inner ring of the bearing 21, so that the clamp 22 is rotatably attached to the tracer head 4, but its operation is the same as in the previous embodiment. The same or corresponding parts are given the same reference numerals as in FIG. 2.

As described above with respect to the embodiments, the present invention has the following features:
A clamp with three tightening screws arranged radially is attached to the tracer head in a concentric and rotatable manner, so when the stylus is attached eccentrically, it can be easily rotated using a dial gauge, etc. This can be easily detected by adjusting the three tightening screws. Therefore, even with a particularly long stylus, accurate tracing can be expected without reading errors due to eccentricity, which has a remarkable effect on improving machining accuracy. In addition, the stylus rolls on the surface of the model during scanning, reducing frictional resistance, which is advantageous for further improving accuracy.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a perspective view of the entire copy milling machine, FIG. 2 is a vertical cross-sectional view of the stylus attachment part, and FIG.
- An X-ray cross-sectional view, and FIG. 4 is a vertical cross-sectional view of a stylus mounting portion showing another embodiment. 4... Tracer head, 5... Stylus,
9...Bearing, 13...Clamp, 17...Tightening screw.

Claims (1)

[Claims] 1. A stylus mounting clamp comprising three tightening screws arranged radially around a stylus mounting hole is mounted concentrically and rotatably to the tracer head by interposing a bearing. Stylus mounting device for copy milling machine.